Boeing ASB 747-25A3368: Revision 2, text

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Commercial Airplane Group 747 Service Bulletin Number: 747-25A3368 Date: August 25, 2005 Revision 2: June 12, 2008 ATA System: 2557 SUBJECT: EQUIPMENT/FURNISHINGS - Main Deck Cargo Systems - Electrical/Electronic Rack Moisture Barrier Installation Export of this technology is controlled under the United States Export Administration Regulations (EAR) (15 CFR 730-774). An export license may be required before it is used for development, production or use by foreign persons from specific countries. The controller of this data has the individual responsibility to abide by all export laws.

9E991ECCN:

BOEING PROPRIETARY, CONFIDENTIAL, AND/OR TRADE SECRET Copyright © 2005 The Boeing Company Unpublished Work - All Rights Reserved Boeing claims copyright in each page of this document only to the extent that the page contains copyrightable subject matter. Boeing also claims copyright in this document as a compilation and/or collective work.

This document includes proprietary information owned by The Boeing Company and/or one or more third parties.

Treatment of the document and the information it contains is governed by contract with Boeing. For more information, contact The Boeing Company, P .O. Box 3707, Seattle, Washington 98124.

Boeing, the Boeing signature, the Boeing symbol, 707, 717, 727, 737, 747, 757, 767, 777, 787, Dreamliner, BBJ, DC-8, DC-9, DC-10, MD-10, MD-11, MD-80, MD-88, MD-90, and the Boeing livery are all trademarks owned by The Boeing Company; and no trademark license is granted in connection with this document unless provided in writing by Boeing.

August 25, 2005 747-25A3368Revision 2: June 12, 2008 1 of 119

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August 25, 2005 747-25A3368Revision 2: June 12, 2008 2 of 119 BOEING SERVICE BULLETIN 747-25A3368

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Table of Contents

Revision Transmittal Sheet5

Summary7

1. PLANNING INFORMATION ........................................ 1 1 A. Effectivity ............................................... 1 1

1. Airplanes ............................................ 1 1

2. Spares Affected ........................................ 1 3 B. Concurrent Requirements ...................................... 1 4 C. Reason ................................................ 1 4 D. Description .............................................. 1 6 E. Compliance .............................................. 1 7 F . Approval ............................................... 1 7 G. Manpower .............................................. 1 7 H. Weight and Balance Changes .................................... 2 2 I. Electrical Load Data ......................................... 2 2 J. References .............................................. 2 2

1. Existing Data: .......................................... 2 2

2. Data supplied with this Service Bulletin: ........................... 2 2

3. Installation Drawings Used in the Preparation of this Service Bulletin: ........... 2 2 K. Publications Affected ......................................... 2 3 L. Interchangeability and Intermixability of Parts ........................... 2 3

2. MATERIAL INFORMATION ........................................ 2 5 A. Material - Price and Availability ................................... 2 5 B. Industry Support Information .................................... 2 5 C. Parts Necessary For Each Airplane ................................. 2 5

1. Kits/Parts: ............................................ 2 5

2. Parts and Materials Supplied by the Operator: ........................ 2 9

3. Parts Modified and Reidentified: ................................ 3 0

4. Parts Removed and Not Replaced: .............................. 3 0 D. Parts Necessary to Change Spares ................................. 3 0 E. Special Tooling - Price and Availability ............................... 3 0 F . Special Tooling Necessary to do this Service Bulletin ....................... 3 0

3. ACCOMPLISHMENT INSTRUCTIONS .................................. 3 1 A. GENERAL INFORMATION ..................................... 3 1 B. WORK INSTRUCTIONS ....................................... 3 1 FIGURE 1: RIGHT MOUNTING PLATE AND SUPPORT ANGLE INSTALLATION - ALL GROUPS . . 35 FIGURE 2: LEFT MOUNTING PLATE AND SUPPORT ANGLE INSTALLATION - GROUPS 1 AND 2, CONFIGURATION 1 AND 3 .................................. 4 2 FIGURE 3: LEFT MOUNTING PLATE AND SUPPORT ANGLE INSTALLATION - GROUPS 1 AND 2, CONFIGURATION 2 AND 4 .................................. 4 8 FIGURE 4: CENTER MOUTING PLATE AND SUPPORT ANGLE INSTALLATION - GROUPS 1 AND 2, CONFIGURATION 1 AND 2 .................................. 5 5 FIGURE 5: CLOSEOUT INSTALLATION - GROUPS 1 AND 2, CONFIGURATION 1 AND 3 ...... 6 3 FIGURE 6: CLOSEOUT INSTALLATION - GROUPS 1 AND 2, CONFIGURATION 2 AND 4 ...... 7 0 FIGURE 7: MOISTURE CURTAIN INSTALLATION - GROUP 1 AIRPLANES .............. 7 7 FIGURE 8: MOISTURE CURTAIN INSTALLATIOIN - GROUP 2 AIRPLANES .............. 8 5 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.

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FIGURE 9: CENTER MOUTING PLATE AND SUPPORT ANGLE INSTALLATION - GROUPS 1 AND 2, CONFIGURATION 3 AND 4 .................................. 9 1 FIGURE 10: FASTENER CAP SEALING - ALL GROUPS ......................... 9 6 FIGURE 11: RIGHT MOUNTING PLATE AND SUPPORT ANGLE INSTALLATION [Group 3] ...... 9 8 FIGURE 12: LEFT MOUNTING PLATE AND SUPPORT ANGLE INSTALLATION [Group 3] ...... 1 0 4 FIGURE 13: CENTER MOUNTING PLATE AND SUPPORT ANGLE INSTALLATION [Group 3] .... 1 1 0 FIGURE 14: RUBBER CLOSEOUT INSTALLATION [Group 3] ...................... 1 1 5 APPENDIX A: FABRICATION OF SHIMS .................................. 1 1 8 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.

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Commercial Airplane Group 747 Service Bulletin Revision Transmittal SheetNumber: 747-25A3368Date: August 25, 2005 Revision 2: June 12, 2008 ATA System: 2557 SUBJECT: EQUIPMENT/FURNISHINGS - Main Deck Cargo Systems - Electrical/Electronic Rack Moisture Barrier Installation This revision includes all pages of the service bulletin.

COMPLIANCE INFORMATION RELATED TO THIS REVISION Federal Aviation Administration (FAA) Notice of Proposed Rule Making 2007-NM-322-AD, is related to this service bulletin.

No more work is necessary on airplanes changed as shown in the original issue and Revision 01 of this service bulletin.

Airplanes RD646 and RD771 were added to Group 1of this service bulletin effectivity.

Airplanes RA101-RA103, RA112, RA161-RA163, RA784, RA910 were added to Group 2 of this service bulletin effectivity.

REASON FOR REVISION This revision is sent to add instructions to install the moisture curtains and rubber closeout on airplanes that have already installed the large PDU drain pans.

These sections were changed:

1. In Effectivity, Section 1.A., moved airplanes RD301, RD302, RD411, RD412, RS721, RS722, RS762 from Group 1, into new Group 3.

2. In Effectivity, Section 1.A., added airplanes RD646 and RD771 to Group 1.

3. In Effectivity, Section 1.A., added airplanes RA101-RA103, RA112, RA161-RA163, RA784, RA910 to Group

4. In Compliance, Section 1.E., added NPRM 2007-NM-322-AD to compliance statement.

5. In Operator Supplied Parts, Section 2.C.2., added new table for Group 3 airplanes to include parts fabricated in Appendix A

6. New Figure 11, Figure 12, Figure 13, Figure 14 have been added.

7. New Appendix A was added to include instructions to fabricate parts.

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Vertical lines are put on the left edge of each page, except in Paragraph 1.A., Effectivity, to show the location of important changes.

Pages with no vertical lines have no important changes.

REVISION HISTORY August 25, 2005Original Issue:

June 25, 2007Revision 1:

June 12, 2008Revision 2:

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Commercial Airplane Group 747 Service Bulletin SummaryNumber: 747-25A3368Date: August 25, 2005 Revision 2: June 12, 2008 ATA System: 2557 SUBJECT: EQUIPMENT/FURNISHINGS - Main Deck Cargo Systems - Electrical/Electronic Rack Moisture Barrier Installation

CONCURRENT REQUIREMENTS None

BACKGROUND This change will provide protection for the electrical/electronics units in main equipment center from water contamination.

When loading cargo in rain or snow conditions, a large amount of water can come into the airplane on the cargo or open main deck doors. The water can spill onto the main deck cargo floor and flow through the power drive units (PDU's). If the amount of water exceeds the drain capacity of the PDU's above the main equipment center, water can spill onto the electrical/electronic units. Water contamination of the electrical/electronic units may cause the electrical/electronic units to malfunction.

Three 747 Special Freighter operators have reported water contamination in the electrical/electronic units in the main equipment center. The water contamination resulted in malfunctions and replacement of multiple electrical/electronic units in the main equipment center. One operator experienced an air turn back due to malfunctions of electronic equipment in the main equipment center resulting in high pilot workload and minimal cockpit indication.

This change provides a closeout panel and moisture curtains to protect the electrical/electronics units in the main equipment center from water contamination.

Boeing Service Related Problem (SRP) 747-SRP-25-0228 is related to this service bulletin.

ACTION (PRR 85901-43RS) Remove the units from the top row of the electrical/electronics rack. Install mounting plates and support angles.

Install closeout. Install moisture curtains. Install and test units on the top row of the electrical/electronics rack.

EFFECTIVITY 747 Special Freighter Airplanes. Refer to service bulletin Paragraph 1.A.1 for detailed effectivity.

COMPLIANCE Federal Aviation Administration (FAA) Notice of Proposed Rule Making 2007-NM-322-AD, is related to this service bulletin.

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Boeing recommends that operators do this service bulletin as soon as manpower, material and facilities are available, not to exceed 24 months after the release date on this service bulletin.

INDUSTRY SUPPORT INFORMATION Boeing warranty remedies are available for airplanes in warranty as of December 12, 2002. Please refer to Paragraph 2.B., Industry Support Information.

MANPOWER Elapsed HoursTotal Task HoursAirplanes

9.7018.63Group 1, Configuration 1

10.1619.55Group 1, Configuration 2

9.8618.95Group 1, Configuration 3

10.3219.87Group 1, Configuration 4

9.5818.39Group 2, Configuration 1

10.0419.31Group 2, Configuration 2

9.7418.71Group 2, Configuration 3

10.2019.63Group 2, Configuration 4

11.3721.98Group 3, Configuration 1

11.8322.90Group 3, Configuration 2

MATERIAL INFORMATION Boeing Supplied Kits.

Refer to Paragraph 2.A., Material - Price and Availability.

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BOEING SERVICE BULLETIN 747-25A3368

INSTALL MOISTURE BARRIER

SUPPORT STRUCTURE

INSTALL CLOSEOUT

REMOVE THE TOP PANEL

SHELF COMPONENT

INSTALL MOISTURE BARRIER

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1. PLANNING INFORMATION A. Effectivity

1. Airplanes Refer to Service Bulletin Index Document D6-30300 Part 3 for Airplane Variable Number, Line Number, and Serial Number data.

This service bulletin is for the airplanes shown below. Refer to PRR 85901-43RS for data about this change.

DESCRIPTIONCONFIGURATIONGROUP Airplanes with a P73 Panel located forward of the existing water shield -1 Airplanes without a PDU 4L installed (29 pallet cargo system)1 Airplanes with a PDU 4L installed (30 pallet cargo system)2 Airplanes without a PDU 4L installed (29 pallet cargo system) and have the extended shear web installed.

3 Airplanes with a PDU 4L installed (30 pallet cargo system) and have the extended shear web installed.

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DESCRIPTIONCONFIGURATIONGROUP Airplanes with a P73 Panel located aft of the existing water shield-2 Airplanes without a PDU 4L installed (29 pallet cargo system)1 Airplanes with a PDU 4L installed (30 pallet cargo system)2 Airplanes without a PDU 4L installed (29 pallet cargo system) and have the extended shear web installed.

3 Airplanes with a PDU 4L installed (30 pallet cargo system) and have the extended shear web installed.

4 Airplanes with a P73 Panel locate forward of the existing watershield and have the large PDU drain pans installed.

-3 Airplanes without a PDU 4L installed (29 pallet cargo system)1 Airplanes with a PDU 4L installed (30 pallet cargo system)2 Airplane Models:

747-100, 747-200B, 747-300, 747SR GroupVariable Number 2RA026 2RA029 2RA033 2RA101 - RA103 2RA112 2RA161 - RA163 2RA524 2RA632 2RA634 - RA635 2RA784 2RA901 - RA902 2RA910 - RA913 2RA915 - RA916 1RB604 - RB605 1RB607 1RB696 BOEING PROPRIETARY - Copyright © Unpublished Work - See page 1 for details.

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